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ARM: exynos: Move to generic PM domain DT bindings

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This patch moves Exynos PM domain code to use the new generic PM domain
look-up framework introduced in previous patches, thus also allowing
the new code to be compiled with CONFIG_ARCH_EXYNOS.

This patch was originally submitted by Tomasz Figa when he was employed
by Samsung.

Link: http://marc.info/?l=linux-pm&m=139955336002083&w=2
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Tomasz Figa 2014-09-19 20:27:43 +02:00 committed by Rafael J. Wysocki
parent 207f1a2d29
commit a4a8c2c496
3 changed files with 8 additions and 85 deletions
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13
Documentation/devicetree/bindings/arm/exynos/power_domain.txt
View File

@ -8,6 +8,8 @@ Required Properties:
* samsung,exynos4210-pd - for exynos4210 type power domain.
- reg: physical base address of the controller and length of memory mapped
region.
- #power-domain-cells: number of cells in power domain specifier;
must be 0.
Optional Properties:
- clocks: List of clock handles. The parent clocks of the input clocks to the
@ -29,6 +31,7 @@ Example:
lcd0: power-domain-lcd0 {
compatible = "samsung,exynos4210-pd";
reg = <0x10023C00 0x10>;
#power-domain-cells = <0>;
};
mfc_pd: power-domain@10044060 {
@ -37,12 +40,8 @@ Example:
clocks = <&clock CLK_FIN_PLL>, <&clock CLK_MOUT_SW_ACLK333>,
<&clock CLK_MOUT_USER_ACLK333>;
clock-names = "oscclk", "pclk0", "clk0";
#power-domain-cells = <0>;
};
Example of the node using power domain:
node {
/* ... */
samsung,power-domain = <&lcd0>;
/* ... */
};
See Documentation/devicetree/bindings/power/power_domain.txt for description
of consumer-side bindings.

78
arch/arm/mach-exynos/pm_domains.c
View File

@ -105,78 +105,6 @@ static int exynos_pd_power_off(struct generic_pm_domain *domain)
return exynos_pd_power(domain, false);
}
static void exynos_add_device_to_domain(struct exynos_pm_domain *pd,
struct device *dev)
{
int ret;
dev_dbg(dev, "adding to power domain %s\n", pd->pd.name);
while (1) {
ret = pm_genpd_add_device(&pd->pd, dev);
if (ret != -EAGAIN)
break;
cond_resched();
}
pm_genpd_dev_need_restore(dev, true);
}
static void exynos_remove_device_from_domain(struct device *dev)
{
struct generic_pm_domain *genpd = dev_to_genpd(dev);
int ret;
dev_dbg(dev, "removing from power domain %s\n", genpd->name);
while (1) {
ret = pm_genpd_remove_device(genpd, dev);
if (ret != -EAGAIN)
break;
cond_resched();
}
}
static void exynos_read_domain_from_dt(struct device *dev)
{
struct platform_device *pd_pdev;
struct exynos_pm_domain *pd;
struct device_node *node;
node = of_parse_phandle(dev->of_node, "samsung,power-domain", 0);
if (!node)
return;
pd_pdev = of_find_device_by_node(node);
if (!pd_pdev)
return;
pd = platform_get_drvdata(pd_pdev);
exynos_add_device_to_domain(pd, dev);
}
static int exynos_pm_notifier_call(struct notifier_block *nb,
unsigned long event, void *data)
{
struct device *dev = data;
switch (event) {
case BUS_NOTIFY_BIND_DRIVER:
if (dev->of_node)
exynos_read_domain_from_dt(dev);
break;
case BUS_NOTIFY_UNBOUND_DRIVER:
exynos_remove_device_from_domain(dev);
break;
}
return NOTIFY_DONE;
}
static struct notifier_block platform_nb = {
.notifier_call = exynos_pm_notifier_call,
};
static __init int exynos4_pm_init_power_domain(void)
{
struct platform_device *pdev;
@ -202,7 +130,6 @@ static __init int exynos4_pm_init_power_domain(void)
pd->base = of_iomap(np, 0);
pd->pd.power_off = exynos_pd_power_off;
pd->pd.power_on = exynos_pd_power_on;
pd->pd.of_node = np;
pd->oscclk = clk_get(dev, "oscclk");
if (IS_ERR(pd->oscclk))
@ -228,15 +155,12 @@ static __init int exynos4_pm_init_power_domain(void)
clk_put(pd->oscclk);
no_clk:
platform_set_drvdata(pdev, pd);
on = __raw_readl(pd->base + 0x4) & INT_LOCAL_PWR_EN;
pm_genpd_init(&pd->pd, NULL, !on);
of_genpd_add_provider_simple(np, &pd->pd);
}
bus_register_notifier(&platform_bus_type, &platform_nb);
return 0;
}
arch_initcall(exynos4_pm_init_power_domain);

2
kernel/power/Kconfig
View File

@ -304,7 +304,7 @@ config PM_GENERIC_DOMAINS_RUNTIME
config PM_GENERIC_DOMAINS_OF
def_bool y
depends on PM_GENERIC_DOMAINS && OF && !ARCH_EXYNOS
depends on PM_GENERIC_DOMAINS && OF
config CPU_PM
bool